Abstract: Compositions for well cementing comprise a pumpable slurry of cement, water and at least one additive that swells in contact with an underground fluid (hydrocarbon, water or brines or mixtures thereof). In case of failure of the cement matrix after setting, the additive swells when contacted by the underground fluid and restores zonal isolation. The swelling additive is an elastomer compounded with an aqueous inverse emulsion of particles of a polymer comprising a betaine group.

Abstract: A self-healing cement for use in wells in which carbon dioxide is injected, stored or extracted, comprises a carbonaceous material. In the event of cement-matrix failure, or bonding failure between the cement/casing interface or the cement/borehole-wall interface, the material swells when contacted by carbon dioxide. The swelling seals voids in the cement matrix, or along the bonding interfaces, thereby restoring zonal isolation.

Abstract: The disclosure relates to a composition for well cementing in a subterranean formation comprising a pumpable slurry of cement, water and at least one additive that swells in contact with underground fluid (hydrocarbon, water or brines and mixtures thereof) in case of failure of the cement matrix and to a method of cementing a well using said composition. The swelling additive is an elastomer compounded with an aqueous inverse emulsion of particles of a polymer comprising a betaine group.

Abstract: A system and method for performing an adaptive wellsite operation about a wellsite having a sub-surface system with a wellbore formed through at least one subterranean formation, wherein the subterranean formations are configured to store fluid. The system has a containment unit. The containment unit has a static model unit for generating a static model of a subsurface system. The static model unit further has a defect model unit for generating a defect model. The containment unit has a dynamic leak model unit for generating a dynamic leak model. The containment unit has a leak mitigation unit for providing at least one containment plan. The leak mitigation unit and the dynamic leak model unit are integrated for passing data therebetween and whereby the containment plan may be adapted as the static model, the defect model, and/or the dynamic model is generated.

Abstract: A method and apparatus for estimating the time varying mechanical properties of a cement including propagating acoustic waves through a cement sample, measuring signals corresponding to the acoustic waves after they propagate in the sample, comparing attributes from the measured signals with corresponding attributes provided by a model accounting for at least initially estimated acoustic properties of the cement, using the differences between the measured and calculated signals to update the initially estimated acoustic properties of the material in the calculating model, using the differences between the measured and calculated signals, updating the initial acoustic properties in the model, processing N iterations of the comparison and updating either until the differences between measured and calculated signals are within a given tolerance factor or when the number i reaches a prescribed maximum and calculating the time varying mechanical properties of the cement from the final iterated acoustic properties.

Abstract: The invention describes a method for estimating the time varying mechanical properties of a material comprising:

Abstract: A spacing fluid or “spacer”, of the type comprising a fluid and particles, notably particles of loading agent, as well as possibly normal additives, such as a viscosity-increasing polymer, for separating a cement slurry from borehole fluids during a well cementing operation, characterised in that the spacing fluid has a density close that of the drilling fluid or mud and a viscosity close to that of water, by virtue of the adaptation of the size of the particles to a value less than 5 microns, particularly around 2 to 3 microns or around 0.2 to 0.3 microns, such as by the use of magnesium oxide or rutile.

Abstract: A method for estimating the time varying mechanical properties of a material comprising: propagating acoustic waves through a sample of material; measuring signals corresponding to acoustic waves after they propagate in the sample; and characterised by: comparing attributes from the measured signals with attributes from corresponding signals provided by a calculating model, the calculating model accounting for at least initially estimated acoustic properties of the material; using the differences between the measured and calculated signals to update the initially estimated acoustic properties of the material in the calculating model; processing N iterations of the comparison and updating either until the differences between measured and calculated signals are within a given tolerance factor or when the number i reaches a prescribed maximum; and calculating the time varying mechanical properties of the material from the final iterated acoustic properties.